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In the high-energy ball milling process coarse-grained structures undergo disassociation as the result of severe cyclic deformation induced by milling with stiff balls in a high-energy shaker mill 8 9 . This process has been successfully used to produce metals with minimum particle sizes from 4 to 26 nm.

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Ball mills are simple in design consisting of horizontal slow rotating vessels half filled with grinding media of ¼" to 1.5". The particles to be milled are trapped between the grinding media or balls and are reduced in size by the actions of impact and attrition.

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The ball milling process is carried out for approximately 100–150 h to obtain uniform-sized fine powder. In high-energy ball milling vacuum or a specific gaseous atmosphere is maintained inside the chamber. High-energy mills are classified into attrition ball mills planetary ball mills vibrating ball mills and low-energy tumbling mills

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Working Volume in High-Energy Ball-Milling Process on Breakage Characteristics and Adsorption Performance of Rice Straw Ash. Arabian Journal for Science and Engineering 2018 43 (11) .

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